Which of the following occur as a sulphide ore?
Ca,Zn,Ag,Cr,Fe,Hg,Pb,Cu

Q. $Li$, $K$, $Ca$, $Na$, $Mg$, $Al$, $Zn$, $Fe$, $Pb$, $Cu$, $Hg$, $Ag$
$I$. The reaction $Zn\left(s\right)+Cu{\left({NO}_3\right)}_2\left(aq\right)\to Cu\left(s\right)+Zn{\left({NO}_3\right)}_2\left(aq\right)$ will occur.
$II$. Zinc and copper are both transition metals.

Q. How many of the following metals is extracted by self reduction process?
$Pb,Au,Mg,Sn,Fe,Al,Ag,Hg,Na,Zn,Cu,Ca$

Q. $Li$, $K$, $Ca$, $Na$, $Mg$, $Al$, $Zn$, $Fe$, $Pb$, $Cu$, $Hg$, $Ag$
Which metal will displace hydrogen from acids but not water?

Q. $Li$, $K$, $Ca$, $Na$, $Mg$, $Al$, $Zn$, $Fe$, $Pb$, $Cu$, $Hg$, $Ag$
$I$. The reaction $3Fe\left(s\right)+2Al{\left({NO}_3\right)}_3\left(aq\right)\to 2Al\left(s\right)+3Fe{\left({NO}_3\right)}_2\left(aq\right)$ will occur.
$II$. Iron is higher on the activity series than aluminum.

Q. The arrangement of some of the metals forming thermoelectric series is Sb, Fe, Zn, Ag, Mo, Cr,Sn, Pb, Hg, Mn, Cu, Co, Ni, Bi.
Arrange the following thermo-couples in the ascending order of producing thermo emf at a particular constant temperature
a) Fe - CO b) Sb - Bi
c) Ag - Mn d) Zn - Cu